Reboring machine



I 1941- E. A. FUGLIE 'REBORING MACHINE Filed DEC. 10, 1940 3 Sheets-Sheet 1 f 0 t n 8 U I g /Wer &

Attorney Aug. 12, 1941. E. A. FUGLIE REBORI NG MACHINE 3 Sheets-Sheet 2 Filed Dec. 10, 1940 Attorney Patented Aug. 12, 1941 UNITED STATES PATENT OFFICE 2,252,121 REBO-RING MACHINE, Elmer A. Fuglie, Winona, Minn.

Application December 10, 1940, Serial No. 369,506

2 Claims.

My invention relates to improvements in machines for reboring the bearings of connecting rods, particularly those used in automobile engmes.

The principal object of the invention is to provide a simply constructed, portable machine of few parts in which a connecting rod may be quickly clamped for reboring in accurately centered position relative to a cutting tool and the tool accurately and quickly set by micrometer adjustment of the machine.

To the accomplishment of the above, and subordinate objects presently appearing, a preferred embodiment of my invention has been illustrated in the accompanying drawings, set forth in detain in the succeeding description, and defined in the claims appended hereto.

In said drawings:

Figure 1 is a view in side elevation, partly in section, of the preferred embodiment of my invention,

Figure 2 is a view in top plan,

Figure 3 is a view in front elevation,

Figure 4 is a transverse section taken on the line 4--4 of Figure 1 and drawn to an enlarged scale, and

Figure 5 is a fragmentary view in longitudinal section taken on the line 5--5 of Figure 3.

Referrin to the drawings by numerals, my improved machine comprises a suitable elongated base I having a pair of front and rear end bearings 2, 3, arising therefrom and connected by a reinforcing web 4 extending longitudinally and centrally of said base with an upstanding bearing sleeve 5 arising from the same intermediate said bearings 2, 3, and terminating at a lower level than the latter. The bearings 2, 3, are of the split sleeve 'type adjustable by screw bolts 2', 3, to take up wear in the usual manner. The front bearing 2 has formed integrally therewith, in front of the same, and concentric thereto, an upstanding, annular pillow block Ii having a flat face I perpendicular to the axis of the block and bearings 2, 3. The pillow block 6 is provided with a recess 9 in the face I thereof extending upwardly from the bore II] of the pillow block and said block embodies in its upper portion a split clamping sleeve II. Both the recess 9 and sleeve II are disposed in the vertical center of the block 6 and radially of the bore Ill. The function of the pillow block 6, recess 9 and sleeve II will presently appear.

Fitted in the bearings 2, 3, and in the bore I0 of the pillow block 6 for rotation and endwise sliding movement therein is a tool operating shaft I2 having its front and rear ends suitably extended beyond said bearings. A suitable hand crank I3 is threaded, as at I4, into the rear end of said shaft I2 for rotating the same. The shaft I2 is threaded, intermediate the bearings 2, 3, as at I5, for engagement by a threaded, preferably rectangular nut I6 slidably fitted in the bearing sleeve 5 and spring pressed, as at H, upwardly toward engagement with said threads I5. A set screw I8 extended into the sleeve 5 provides for clamping the nut IS in engagement with said threads I5, whereby, under rotation of said shaft I2 in opposite directions, it will be fed endwise forwardly and rearwardly, respectively.

A cutting tool I9 of the usual type is slidably mounted in a diametrical, square, socket 2!) provided in said shaft I2 in front of the pillow block 6, the arrangement being such that said tool may be adjusted in the socket 20 into different set positions to variably position its cutting end out of the socket to cut bores of different diameters under rotation and endwise feed of the shaft I2.

A pair of longitudinally extending bores 2|, 22 are provided in the front end of the shaft I2 in advance of the socket 2B, the bore 2| being in the axis of the shaft I2 and the bore 22 radially offset from said axis, both bores communicating with the socket 20. A pair of tool clamping plugs 23, 24 are slidably fitted in the inner ends of the bores 2|, 22, respectively, to bear against said tool I9.

A set screw 25 threaded into the bore 2| provides for clamping the plug 23 against the tool I9 to establish different set positions of said tool.

A screw plug 26 threaded into the outer end of the bore 22, and a coil spring 21 in said bore interposed between said plug and the plug 24, provide for frictionally clamping the latter against the tool I9 to yieldingly hold the same during adjustment.

A micrometer 28 with an adjustable stem 29 is clamped in the sleeve II with its stem extending downwardly into the recess 8 radially of the shaft I2.

A pair of apertured bearing ears 30 are provided upon diametrically opposite sides of the pillow block 6, and a similar pair of ears 3| in similar position on the front bearing 2 behind the ears 30. A pair of hook-shaped rod-like clamps 32 are mounted in the pairs of ears 30, 3|, on opposite sides of the block 6 and bearing 2 for endwise and rotary adjustment to clamp the bearing end a of a connecting rod b against the face 1 of the pillow block 6 concentrically of the shaft l2. Wing nuts 33 threaded onto the rear ends of said clamps 32 for turning against the ears 3| provide for adjusting said clamps endwise into clamping position.

For centering the bearing end a of rod 1) relative to the shaft I2 a tapered bushing 34 is provided for sliding over the outer end of the shaft [2 into the bearing end a ofthe rod 17, said bushing being longitudinally slotted, as at 35, to accommodate the cutting end of the tool l9.

Referring now to the operation of the described invention, the micrometer 28 is set to a reading giving the selected diameter to be rebored, the inner end of the stem 29, as will be understood, establishing the diameter. The set screw I8 is then loosened and the nut IB- disengaged from the threads l of shaft [2 so that the latter may be pushed backwards and said nut clamped by said screw in disengaged position. The set screw 25 is then loosened to free the tool IQ for adjust- .ment in the socketiil, said tool being yieldingly he1dbyp1ug24 and spring 21. The shaft I2 is then moved back in the bearings 2, 3, to enter the cutting end of the tool K9 in the recess 8 of the'lpillow block 6 so that the cutting end may be rubbedagainst the inner end of the micrometerstem 29. Thus the set position of the tool 19 is determined. The set screw 25 is then tightened to clampthe tool in set position. The nut I6 is next engaged with screw threads l5 and clamped -byset screw l8 in engaged position. The beardngend a of rod b is next placed over the front end -of the shaft I2, flat against the face I of the pillow block. 6. Bushing 34 may then be sleeved over the front endof the shaft 12 andextended into the bearing end a to center said end on the shaft-l2. Said'end .a of rod b may then be clamped to the face lof the pillow block 6 by the clamps 32. "As will now be seen, under operation of the crank The bushing 34 is then removed.

-13 in the proper direction, the shaft 12 may be fed forwardly and rotated to feed the tool I 9 into the bearing end a of the rod b and rotate the" The foregoing will, it is believed, suffice to impart a clear undertanding of my invention, without further explanation.

Manifestly the invention, as described, is susceptible of modification without departing from the inventive concept, and right is herein reserved to such modifications as fall within the scope of the subjoined claims.

What I claim is:

1. In a machine of the class described, a base, a tool operating shaft endwise slidable on said base and rotatable thereon and having a front tool carrying end, a cutting tool mounted in said end of the shaft and adjustable endwise into different set positions diametrically thereof, and

-means to predetermine the settings for said tool comprising a split clamping block arising from said base overthe front end of the shaft and having a recess therein into which the tool may be retracted by endwise movement of said shaft, and a micrometer clamped in said block and having a stem extending into said recess and adjustable radially of said shaft for engagement by the cutting end of the tool to predetermine the setting thereof.

2. In a machine of the class described, a base, a tool operating shaft endwise slidable on said base and rotatable thereon and having a front tool carrying end, a cutting tool mounted in said end of the shaft and adjustable endwise into different set positions diametrically thereof, means to predetermine the settings for said tool comprising a split clamping block arising from said base over the front end of the shaft and having a recess therein into which the tool may be retracted by endwise movement of said shaft, and a micrometer clamped in said block and having a stem extending into said recess and adjustable radially of said shaft for engagement by the cutting end of the tool to predetermine the setting thereof, an axial set screw in said shaft adjustable to clamp the tool in different set positions, and a spring pressed plug in said shaft bearing against said tool and yieldingly holding the same in set position during adjustment of said screw.

ELMER A. FUGLIE. 

